CN112876948B

CN112876948B - Solvent-free coating and preparation method and application thereof

Info

Publication number: CN112876948B
Application number: CN202110062066.3A
Authority: CN
Inventors: 张秋源; 李金钟; 徐志新
Original assignee: ASIA PAINT (SHANGHAI) CO LTD; Asia Cuanon Technology Chuzhou Co ltd
Current assignee: ASIA PAINT (SHANGHAI) CO LTD; Asia Cuanon Technology Chuzhou Co ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2022-07-15
Anticipated expiration: 2041-01-18
Also published as: CN112876948A

Abstract

The invention relates to a solvent-free paint and a preparation method and application thereof, wherein the solvent-free paint comprises a component A and a component B, the component B comprises a curing agent, and the component A comprises the following components in percentage by mass: 30% -40% of first resin, 3.5% -4% of first reactive diluent, 2% -3% of modified bentonite pre-gel, 0.2% -0.8% of defoaming agent, 0.2% -0.8% of leveling additive and 40% -60% of filler; the modified bentonite pre-gel comprises bentonite, and a second resin and a second reactive diluent which are filled in the pores of the bentonite. The coating provided by the invention can meet the requirements of smoothness and thickness of a surface coating under the condition of one-time coating, has no bubble shrinkage cavity, has excellent wear resistance, impact resistance, scratch resistance and acid and alkali chemical corrosion resistance, has long service life, is not easy to crack, and can be automatically leveled according to the height unevenness and the smoothness of the ground.

Description

Solvent-free coating and preparation method and application thereof

Technical Field

The invention relates to the technical field of coatings, in particular to a solvent-free coating and a preparation method and application thereof.

Background

The existing organic products are mainly solvent type and solvent-free type epoxy self-leveling surface coatings, the solid content of the solvent type epoxy self-leveling surface coatings is low, the cost is low, but the Volatile Organic Compounds (VOC) are extremely high in concentration due to the fact that more organic solvents are added in the production process, the environment is polluted, and the health of human bodies is harmed. The solvent-free epoxy self-leveling surface coating is an environment-friendly floor coating because the used diluent is an expensive active diluent and has no volatility, and belongs to a relatively high-end material on the market. Because of low viscosity before curing, the construction process is relatively simple and easy, the trowelled material can automatically flow according to the terrain, and the trowelled material has excellent wear resistance, impact resistance, scratch resistance, acid and alkali chemical corrosion resistance, long service life and difficult cracking after being completely cured, can be added with color paste according to the needs to randomly select colors, and has the characteristics of fashionable appearance and the like. However, the advantages of the epoxy resin require extremely high requirements on defoaming property, anti-settling property and leveling property of the epoxy material, so that various additives are required to have a synergistic effect in a formula, and the current mainstream technology still uses a large amount of high-end additives of Germany Bick company, and effective substitution cannot be found, so that the price of the products on the market is high.

The inorganic self-leveling mainly refers to a cement-based hydraulic mineral cementing material, which has the characteristics of economic manufacturing cost, obvious defects, simple structure, single functionality and poor decoration. The main hydration products of cement contain a large amount of alkaline substances, are not resistant to chemical corrosion, particularly acid chemical corrosion, and generate a large amount of bubbles in the reaction process, so that the material has extremely large internal stress after being formed and is easy to crack, and the material is difficult to maintain after cracking, so that the service life of the material is extremely short. This makes cement-based materials unsuitable for high-end applications such as electronics factories, hospital sterilization rooms, etc.

At present, epoxy terraces using a flat coating process exist in the market, after the middle bottom coating is finished, a plurality of layers of top coatings need to be scraped to meet the requirements of complete smoothness and thickness of the top coatings, and the epoxy terraces have the defects of long construction time, high labor cost and uncertain field construction quality due to the fact that the epoxy terraces are affected seriously by uneven quality of field operators due to multiple processes. Most of the existing economical self-leveling terraces on the market are cement-based terraces, manual construction is needed, the processes of mortar mixing, spreading, primary leveling, jolt ramming, batch plastering and the like are carried out, time and labor are consumed in each process, the production efficiency is low, the construction cost is increased, the colors are single, and the individualized requirements of consumers on terraces with various colors cannot be met. In a solvent-free epoxy terrace, bentonite is used as an anti-settling agent in a solvent-free formula at present, and due to the strong bubble wrapping capacity of the bentonite, a large amount of bubbles existing on a self-leveling surface can not be eliminated.

Therefore, the problem of bubbles caused by bentonite as an anti-settling agent needs to be solved in the field, and a paint capable of meeting the requirements of smoothness and thickness of a top coating in one-step coating is developed, has excellent wear resistance, impact resistance, scratch resistance, acid and alkali chemical corrosion resistance, long service life, difficulty in cracking and the like, and can be automatically leveled according to the height of the ground and the smoothness.

Disclosure of Invention

The invention aims to provide a solvent-free coating, in particular to a solvent-free floor coating, and particularly provides a solvent-free self-leveling floor coating, which can meet the requirements on the smoothness and thickness of a top coating under the condition of one-time coating, has the performances of excellent wear resistance, impact resistance, scratch resistance, acid and alkali chemical corrosion resistance, long service life, difficult cracking and the like, can automatically level according to the height of the ground and the smoothness, and has lower cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a solvent-free paint which comprises a component A and a component B, wherein the component B comprises a curing agent, and the component A comprises the following components in percentage by mass:

the modified bentonite pre-gel comprises bentonite, and a second resin and a second reactive diluent which are filled in the holes of the bentonite.

In the present invention, the "pregel" refers to a gel prepared in advance, and is not formed by directly mixing bentonite with other raw materials in the component A.

According to the invention, the modified bentonite is added into the solvent-free coating for pregelling, the filling powder is not easy to settle and layer in the coating system due to the thixotropy of the bentonite and the thickening performance of the coating, meanwhile, the modified bentonite prepared by the pregelling method reduces the bubble wrapping performance of the bentonite, and the prepared paint film is not easy to bubble. The anti-settling additive can completely replace an anti-settling additive of a BYK system, so that the problem of high cost of the existing solvent-free epoxy self-leveling terrace is solved.

In addition, the coating provided by the invention has excellent wear resistance, impact resistance, scratch resistance, acid and alkali chemical corrosion resistance, long service life, difficulty in cracking, capability of automatically leveling according to the unevenness of the ground and low cost.

In the above formulation, the first resin is present in an amount of 30% to 40%, e.g., 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, etc., the first reactive diluent is present in an amount of 3.5% to 4%, e.g., 3.6%, 3.7%, 3.8%, 3.9%, etc., the modified bentonite pre-gel is present in an amount of 2% to 3%, e.g., 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, etc., the defoamer is present in an amount of 0.2% to 0.8%, e.g., 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, etc., the leveling aid is present in an amount of 0.2% to 0.8%, e.3%, 0.4%, 0.5%, 0.6%, 0.7%, etc., the filler is present in an amount of 40% to 60%, e.g., 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, etc., the leveling aid is present in an amount of the composition, 54%, 55%, 56%, 57%, 58%, 59%, etc.

Preferably, the bentonite comprises an organic bentonite.

Preferably, the preparation method of the modified bentonite pre-gel comprises the following steps: and mixing a second resin and a second reactive diluent, carrying out primary dispersion stirring, adding bentonite in the primary dispersion stirring process, vacuumizing, and carrying out secondary dispersion stirring to obtain the modified bentonite pre-gel.

Preferably, the second resin comprises 45% to 55%, such as 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc., the second reactive diluent comprises 35% to 45%, such as 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, etc., and the bentonite comprises 9% to 11%, such as 9.2%, 9.4%, 9.6%, 9.8%, 10%, 10.2%, 10.4%, 10.6%, 10.8%, etc., based on 100% total mass of the second resin, second reactive diluent, and bentonite.

According to the invention, the second resin, the second reactive diluent and the bentonite are preferably mixed and modified according to the proportion, and the obtained modified bentonite pre-gel is used in the coating, so that better surface smoothness and anti-settling effect can be obtained.

Preferably, the second resin accounts for 50%, the second reactive diluent accounts for 40%, and the bentonite accounts for 10% of the total mass of the second resin, the second reactive diluent and the bentonite is 100%.

Preferably, the rotation speed of the first dispersion stirring is 1100-1300r/min, preferably 1200 r/min.

Preferably, the time of the first dispersion stirring is 8-12min, preferably 10 min.

Preferably, the vacuum pumping specifically comprises: adjusting the degree of vacuum in units of-30 kPa to-10 kPa (e.g., -28kPa, -26kPa, -24kPa, -22kPa, -20kPa, -18kPa, -16kPa, -14kPa, -12kPa, etc.) and maintaining the pressure immediately after each adjustment; the degree of vacuum is preferably adjusted in units of-20 kPa. When the vacuum degree is adjusted, the liquid level in the kettle is observed, and the pressure is immediately maintained to prevent the rapid overflow of bubbles caused by too fast change of air pressure, so that low-viscosity liquid materials are pumped out to a pipeline.

The invention preferably adjusts the vacuum degree by the specific unit, in the range, the obtained modified bentonite gel can obtain better surface smoothness and anti-settling effect when being used in the coating, the liquid material in the kettle can be quickly increased due to overlarge adjustment amplitude, the liquid material is pumped into a pipeline to damage equipment, and the process is excessively complicated due to the overlong adjustment amplitude, so the production efficiency is low.

Preferably, the vacuum is applied until a vacuum of-101.325 kPa is reached.

Preferably, the rotation speed of the second dispersion stirring is 1200-1600r/min, preferably 1500 r/min.

Preferably, the time of the second dispersion stirring is 8-12min, preferably 10 min.

Preferably, the preparation of the modified bentonite pre-gel is carried out in a vacuum kettle of a Ross planetary stirrer;

preferably, the preparation method of the modified bentonite pre-gel specifically comprises the following steps: mixing a second resin and a second active diluent, performing first dispersion stirring for 8-12min at the rotation speed of 1100-1300r/min, adding bentonite in the first dispersion stirring process, adjusting the vacuum degree by taking-30 kPa to-10 kPa as a unit, maintaining the pressure immediately after each adjustment, and performing second dispersion stirring for 8-12min at the rotation speed of 1200-1600r/min to obtain the modified bentonite pre-gel.

Preferably, the first resin and the second resin are independently selected from any one or at least two combinations of epoxy resin, polyurethane, acrylic resin or phenolic resin, and preferably the first resin and the second resin are the same.

Preferably, the epoxy resin comprises any one or at least two of bisphenol A liquid epoxy resin, polyurethane modified epoxy resin, epoxy acrylic resin or epoxy furan resin. The bisphenol A type liquid epoxy resin includes, but is not limited to, EEW: 185-190.

Preferably, the first reactive diluent and the second reactive diluent are each independently selected from any one or at least two combinations of reactive diluents having a glycidyl ether group, preferably n-butyl glycidyl ether reactive diluent, beta-hydroxyethyl methacrylate (HEMA) or 1, 6-hexanediol diacrylate (HDDA).

According to the invention, the bentonite is preferably modified by using the active diluent with glycidyl ether group, the organic bentonite has extremely strong foam wrapping property and organic adsorbability due to the porous structure and the characteristics of organic modification of the organic bentonite, and the open and closed micropores on the surface of the bentonite are filled with the highly active diluent with glycidyl ether group in advance, so that the foam wrapping property can be reduced, and the surface smoothness of a coating film is further improved.

Preferably, the anti-foaming agent comprises a mixture of a foam-breaking polysiloxane and hydrophobic particles.

Preferably, the levelling aid comprises a polyacrylate surface aid and/or a silicone surface aid.

Preferably, the filler comprises quartz sand and/or ground calcium carbonate.

Preferably, the mesh number of the filler is not less than 325 mesh, such as 350 mesh, 400 mesh, 425 mesh, 450 mesh, 500 mesh, and the like.

Preferably, the A component also includes 0.1% -10% (e.g., 0.2%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, etc.) color paste, preferably 5-10%.

Preferably, the curing agent comprises any one or at least two of modified amine epoxy curing agent, polyamide epoxy curing agent or aliphatic polyamine curing agent.

Preferably, the mass ratio of the A component to the B component is (3.5-4.5):1, e.g. 3.8:1, 4:1, 4.2:1, etc., preferably 4: 1.

The second object of the present invention is to provide a method for preparing a solventless coating material according to the first object, comprising the steps of:

mixing a first resin and a first active diluent according to a formula amount, performing third dispersion stirring, adding a defoaming agent and a leveling assistant according to the formula amount in the third dispersion stirring process, performing fourth dispersion stirring, adding a modified bentonite pre-gel according to the formula amount in the fourth dispersion stirring process, performing fifth dispersion stirring, adding a filler according to the formula amount in the fifth dispersion stirring process, performing sixth dispersion stirring, and cooling to obtain a component A in the solvent-free coating; mixing the component A and the component B.

Preferably, the preparation method further comprises adding color paste after the cooling and manually toning with a paint mixing knife.

Preferably, the rotation speed of the third dispersion stirring is 1000-1400r/min, preferably 1200 r/min.

Preferably, the time of the third dispersion stirring is 8-12min, preferably 10 min.

Preferably, the rotation speed of the fourth dispersion stirring is 1000-1400r/min, preferably 1200 r/min.

Preferably, the time of the fourth dispersion stirring is 8-12min, preferably 10 min.

Preferably, the rotation speed of the fifth dispersion stirring is 1600-2000r/min, preferably 1800 r/min.

Preferably, the time of the fifth dispersion stirring is 8-12min, preferably 10 min.

Preferably, the rotation speed of the sixth dispersion stirring is 1600-2000r/min, preferably 1800 r/min.

Preferably, the time of the sixth dispersion stirring is 20-30min, preferably 25 min.

Preferably, the preparation method specifically comprises the following steps:

(1) mixing a second resin and a second reactive diluent, carrying out first dispersion stirring for 8-12min at the rotating speed of 1100-1300r/min, adding bentonite in the first dispersion stirring process, adjusting the vacuum degree by taking-30 kPa to-10 kPa as a unit, immediately maintaining the pressure after each adjustment until the vacuum degree reaches-101.325 kPa, and carrying out second dispersion stirring for 8-12min at the rotating speed of 1200-1600r/min to obtain modified bentonite pre-gel;

(2) mixing the first resin and the first active diluent according to the formula ratio, performing third dispersion stirring at the rotating speed of 1000-1400r/min for 8-12min, adding the defoaming agent and the leveling assistant in the formula amount in the third dispersing and stirring process, performing fourth dispersing and stirring at the rotating speed of 1000-1400r/min for 8-12min, adding the modified bentonite pre-gel with the formula amount in the fourth dispersion stirring process, performing fifth dispersion stirring for 8-12min at the rotating speed of 1600-2000r/min, adding the filler with the formula amount in the fifth dispersion stirring process, performing sixth dispersion stirring at the rotating speed of 1600-2000r/min for 20-30min, cooling to obtain the component A in the solvent-free coating, and mixing the component A and the component B.

The third purpose of the invention is to provide the application of the solvent-free coating prepared by the first purpose or the solvent-free coating prepared by the second purpose in the preparation of terraces.

Compared with the prior art, the invention has the following beneficial effects:

compared with the scheme of adding unmodified bentonite in the prior art, the solvent-free coating added with the modified bentonite pregelatinized provided by the invention can effectively solve the problem of surface bubbles after film formation, has a better anti-settling effect, and can meet the requirements of smoothness and thickness of a surface coating without bubble shrinkage cavity under the condition of one-time coating. The anti-settling auxiliary agent of a BYK system can be completely replaced, so that the problem of high cost of the existing solvent-free epoxy self-leveling floor is solved.

In addition, the coating provided by the invention has excellent wear resistance, impact resistance, scratch resistance, acid and alkali chemical corrosion resistance, long service life and low possibility of cracking, and can be automatically leveled according to the height of the ground.

Detailed Description

The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitation of the present invention.

Bentonite clay

The bentonite used in the present invention is an organobentonite which may be any commercially available organobentonite, by way of non-limiting example, BP-186.

A first resin

The first resin of the present invention may be one or more of epoxy resin, polyurethane, acrylic resin, phenolic resin.

In certain embodiments, the epoxy resin comprises any one or a combination of at least two of bisphenol a type liquid epoxy resins, urethane-modified epoxy resins, epoxy acrylic resins, or epoxy furan resins. The bisphenol A type liquid epoxy resin includes, but is not limited to, EEW: 185-190.

A second resin

The second resin of the present invention may be one or more of epoxy resin, polyurethane, acrylic resin, phenolic resin.

In certain embodiments, the epoxy resin comprises any one or a combination of at least two of bisphenol a type liquid epoxy resins, urethane-modified epoxy resins, epoxy acrylic resins, or epoxy furan resins. Wherein, the bisphenol A liquid epoxy resin comprises but is not limited to EEW 185-190.

The raw material sources are as follows:

the n-butyl glycidyl ether reactive diluent is available in Yuebao chemical industry;

185-190 Hensmei chemical EEW;

the bentonite is BP-186 provided by Huate of Zhejiang province;

the antifoaming agent is DF-6000 which is commonly used;

the leveling auxiliary agent is FL-633 which is commonly used;

the dispersant is D-8280 commonly used;

acrylic resin: purchased from Jiangsu Sanmu chemical industry, and the brand number is BS-965;

the defoamer was BYK-22764 from Pico Chemicals;

the leveling aid was BYK-354 from Pico Chemicals.

The detection method in the embodiment of the invention adopts national standards.

Example 1

The embodiment provides a solvent-free coating, which comprises a component A and a component B in a mass ratio of 4:1, wherein the component B is a curing agent, and the component A comprises the following components in percentage by mass:

the modified bentonite pre-gel comprises bentonite, and a second resin and a second reactive diluent which are filled in the pores of the bentonite, and the preparation method comprises the following steps:

mixing 50% of second resin and 40% of second reactive diluent in a vacuum kettle of a Ross planetary stirrer, carrying out first dispersion stirring at the rotating speed of 1200r/min for 10min, adding 10% of bentonite in the first dispersion stirring process, adjusting the vacuum degree by taking each-20 kPa as a unit, immediately maintaining the pressure after each adjustment until the vacuum degree reaches-101.325 kPa, and carrying out second dispersion stirring at the rotating speed of 1500r/min for 10min to obtain modified bentonite pre-gel;

the feeding amount is calculated by taking the total mass of the second resin, the second reactive diluent and the bentonite as 100%;

mixing a first resin and a first active diluent according to the formula amount, performing third dispersion stirring at the rotation speed of 1200r/min for 10min, adding a defoaming agent and a leveling assistant according to the formula amount in the third dispersion stirring process, performing fourth dispersion stirring at the rotation speed of 1200r/min for 10min, adding a modified bentonite pre-gel according to the formula amount in the fourth dispersion stirring process, performing fifth dispersion stirring at the rotation speed of 1800r/min for 10min, adding a filler and wax powder according to the formula amount in the fifth dispersion stirring process, performing sixth dispersion stirring at the rotation speed of 1800r/min for 25min, cooling, adding a color paste, and manually toning by using a paint mixing knife to obtain a component A in the solvent-free type coating.

In the embodiment, the curing agent is polyacetamide BSA-135, the first resin and the second resin are EEW 185-190, the first reactive diluent and the second reactive diluent are n-butyl glycidyl ether reactive diluents, the bentonite is BP-186, the antifoaming agent is DF-6000, the leveling aid is FL-633, the filler is 400-mesh quartz sand, and the color paste is brocade middle ash.

Example 2

the modified bentonite pre-gel comprises bentonite, and a second resin and a second reactive diluent which are filled in the holes of the bentonite, and the modified bentonite pre-gel is prepared according to the same method as the embodiment 1;

mixing a first resin and a first active diluent according to the formula amount, performing third dispersion stirring for 10min at the rotation speed of 1200r/min, adding a dispersing agent, a defoaming agent and a leveling assistant according to the formula amount in the third dispersion stirring process, performing fourth dispersion stirring for 10min at the rotation speed of 1200r/min, adding a modified bentonite pre-gel according to the formula amount in the fourth dispersion stirring process, performing fifth dispersion stirring for 10min at the rotation speed of 1800r/min, adding a filler and titanium dioxide according to the formula amount in the fifth dispersion stirring process, performing sixth dispersion stirring for 25min at the rotation speed of 1800r/min, cooling, adding a color paste, and manually toning by using a paint mixing knife to obtain a component A in the solvent-free type coating.

In the embodiment, the curing agent is polyacetamide BSA-135, the first resin and the second resin are 128 epoxy resins, the first reactive diluent and the second reactive diluent are n-butyl glycidyl ether reactive diluents, the bentonite is BP-186, the dispersant is D-8280, the defoamer is DF-6000, the leveling assistant is FL-633, the filler is 325 meshes of heavy calcium, and the color paste is famous black.

Example 3

The embodiment provides a solvent-free coating, which comprises a component A and a component B in a mass ratio of 4.5:1, wherein the component B is a curing agent, and the component A comprises the following components in percentage by mass:

the modified bentonite pre-gel comprises bentonite, and a second resin and a second reactive diluent which are filled in the holes of the bentonite, and the preparation method comprises the following steps:

mixing 50% of second resin and 40% of second reactive diluent in a vacuum kettle of a Ross planetary stirrer, performing first dispersion stirring at the rotating speed of 1100r/min for 12min, adding 10% of bentonite in the first dispersion stirring process, adjusting the vacuum degree by taking-20 kPa as a unit, immediately maintaining the pressure after each adjustment until the vacuum degree reaches-101.325 kPa, and performing second dispersion stirring at the rotating speed of 1200r/min for 12min to obtain modified bentonite pre-gel;

mixing a first resin and a first reactive diluent according to the formula amount, carrying out third dispersion stirring for 12min at the rotating speed of 1000r/min, adding a defoaming agent and a leveling assistant according to the formula amount in the third dispersion stirring process, carrying out fourth dispersion stirring for 12min at the rotating speed of 1000r/min, adding a modified bentonite pre-gel according to the formula amount in the fourth dispersion stirring process, carrying out fifth dispersion stirring for 12min at the rotating speed of 1600r/min, adding a filler according to the formula amount in the fifth dispersion stirring process, carrying out sixth dispersion stirring for 30min at the rotating speed of 1600r/min, cooling, adding a color paste, and carrying out manual color matching by using a paint mixer to obtain a component A in the solvent-free coating.

In this embodiment, the curing agent is polyacetamide BSA-817, the first resin and the second resin are acrylic resins (purchased from sanmu chemical engineering, jiangsu, and the brand is BS-965), the first reactive diluent and the second reactive diluent are n-butyl glycidyl ether reactive diluents, the bentonite is BP-186, the defoamer is BYK-22764, the leveling additive is BYK-354, the filler is 400-mesh quartz sand, and the color paste is brocade ash.

Example 4

The embodiment provides a solvent-free paint which comprises a component A and a component B in a mass ratio of 3.5:1, wherein the component B is a curing agent, and the component A comprises the following components in percentage by mass:

mixing 50% of second resin and 40% of second reactive diluent in a vacuum kettle of a Ross planetary stirrer, carrying out first dispersion stirring for 8min at the rotating speed of 1300r/min, adding 10% of bentonite in the first dispersion stirring process, adjusting the vacuum degree by taking each-20 kPa as a unit, immediately maintaining the pressure after each adjustment until the vacuum degree reaches-101.325 kPa, and carrying out second dispersion stirring for 8min at the rotating speed of 1600r/min to obtain modified bentonite pre-gel;

mixing a first resin and a first reactive diluent according to the formula amount, performing third dispersion stirring for 8min at the rotating speed of 1400r/min, adding a defoaming agent and a leveling assistant according to the formula amount in the third dispersion stirring process, performing fourth dispersion stirring for 8min at the rotating speed of 1400r/min, adding a modified bentonite pre-gel according to the formula amount in the fourth dispersion stirring process, performing fifth dispersion stirring for 8min at the rotating speed of 2000r/min, adding a filler according to the formula amount in the fifth dispersion stirring process, performing sixth dispersion stirring for 20min at the rotating speed of 2000r/min, cooling, adding a color paste, and manually toning by using a paint mixing knife to obtain a component A in the solvent-free coating.

In the embodiment, the curing agent is polyacetamide BSA-135, the first resin and the second resin are EEW 185-190, the first reactive diluent and the second reactive diluent are n-butyl glycidyl ether reactive diluents, the bentonite is BP-186, the defoaming agent is DF-6000, the leveling additive is FL-633, the filler is 400-mesh quartz sand, and the color paste is brocade green.

Example 5

The difference from example 1 is only that the charging amount in step (1) is: 46% of a second resin, 45% of a second reactive diluent and 9% of bentonite.

Example 6

The only difference from example 1 is that the feed rate in step (1) is: 54% of a second resin, 35% of a second reactive diluent and 11% of bentonite.

Example 7

The difference from example 1 is only that the charging amount in step (1) is: 55% of a second resin, 37% of a second reactive diluent and 8% of bentonite.

Example 8

The only difference from example 1 is that the feed rate in step (1) is: 53% of a second resin, 35% of a second reactive diluent and 12% of bentonite.

Example 9

The only difference from example 1 is that the second reactive diluent is diethylene glycol vinyl ether.

Comparative example 1

The only difference from example 1 is that the modified bentonite pre-gel in component a was replaced with unmodified organobentonite BP-186 without performing step (1).

Comparative example 2

The only difference from example 1 is that the modified bentonite pregel content in component a is 1% and the first resin content is 36.7%.

Comparative example 3

The only difference from example 1 is that the content of the modified bentonite pregel in the a component is 4% and the content of the first resin is 33.7%.

Comparative example 4

The only difference from example 1 is that the modified bentonite pregel in component a was replaced by unmodified german BYK-410 without carrying out step (1).

Performance test

The coatings provided in the above examples and comparative examples were subjected to the performance tests shown in tables 1 to 3.

TABLE 1

TABLE 2

TABLE 3

The test results show that the solvent-free coating provided by the invention effectively solves the problems of uneven surface and a large amount of bubbles caused by bentonite, can meet the requirements of smoothness and thickness of a surface coating under the condition of one-time coating, has excellent wear resistance, impact resistance, scratch resistance, acid and alkali chemical corrosion resistance, long service life and difficult cracking, and can automatically level according to the unevenness and the smooth situation of the ground.

It can be known from comparative example 1 and comparative examples 2 to 3 that the content of the modified bentonite pre-gel must be controlled within the range of 2 to 3% to effectively improve the problems of uneven surface and a large amount of bubbles and ensure that the coating has good comprehensive performance, the hard bottom and the compressive strength are deteriorated when the addition amount is too low (comparative example 2), and the bubbles are generated when the addition amount is too high (comparative example 3), and finally the surface of the coating is uneven.

It is understood by comparing examples 1 and 5 to 8 that when the amount of bentonite added is controlled within the range of 9% to 11% in the process of preparing the modified bentonite pre-gel (examples 1, 5 and 6), the overall performance of the coating can be further improved, that when the amount of bentonite added is too low (example 7), hard bottoms can be generated, and when the amount of bentonite added is too high (example 8), a small amount of bubbles can be generated on the surface, and the flatness of the coating surface can be deteriorated.

It is understood from the comparison between example 1 and example 9 that the use of a glycidyl ether group-containing reactive diluent (example 1) can further improve the scratch resistance, hardness and abrasion resistance of the coating material as compared with the conventional reactive diluent (example 9).

The present invention is illustrated in detail by the examples given above, but the present invention is not limited to the details given above, which means that the present invention is not limited to the details given above. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of the raw materials of the product of the present invention, and the addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The solvent-free paint is characterized by comprising a component A and a component B, wherein the component B comprises a curing agent, and the component A comprises the following components in percentage by mass:

the modified bentonite pre-gel comprises bentonite, and a second resin and a second reactive diluent which are filled in the holes of the bentonite;

the preparation method of the modified bentonite pre-gel specifically comprises the following steps: mixing a second resin and a second reactive diluent, carrying out first dispersion stirring for 8-12min at the rotating speed of 1100-1300r/min, adding bentonite in the first dispersion stirring process, adjusting the vacuum degree by taking-30 kPa to-10 kPa as a unit, immediately maintaining the pressure after each adjustment until the vacuum degree reaches-101.325 kPa, and carrying out second dispersion stirring for 8-12min at the rotating speed of 1200-1600r/min to obtain the modified bentonite pre-gel;

the total mass of the second resin, the second reactive diluent and the bentonite is 100%, the second resin accounts for 45-55 wt%, the second reactive diluent accounts for 35-45 wt%, and the bentonite accounts for 9-11 wt%;

the bentonite is organic bentonite;

the first resin and the second resin are respectively and independently selected from any one of bisphenol A liquid epoxy resin, polyurethane modified epoxy resin, epoxy acrylic resin and epoxy furan resin or at least two of the bisphenol A liquid epoxy resin, the polyurethane modified epoxy resin and the epoxy acrylic resin;

the first reactive diluent and the second reactive diluent are each independently selected from reactive diluents having glycidyl ether groups.

2. The solvent-free paint as claimed in claim 1, wherein the first dispersion stirring speed in the preparation process of the modified bentonite pregel is 1200 r/min.

3. The solventless coating according to claim 1, wherein the first dispersion stirring time in the preparation method of the modified bentonite pregel is 10 min.

4. The solvent-free coating according to claim 1, wherein the step of evacuating the process for preparing the modified bentonite pregel comprises: the vacuum was adjusted in units of-20 kPa and the pressure was maintained immediately after each adjustment.

5. The solvent-free coating according to claim 1, wherein the second dispersion stirring is performed at a rotation speed of 1500r/min in the method for preparing the modified bentonite pregel.

6. The solvent-free paint as claimed in claim 1, wherein the second dispersion stirring time in the preparation method of the modified bentonite pre-gel is 10 min.

7. The solvent-free coating of claim 1 wherein the modified bentonite pre-gel is prepared in a vacuum kettle of a Ross planetary mixer.

8. A solvent-free coating according to claim 1, wherein the first resin and the second resin are the same.

9. A solvent free coating as claimed in claim 1 wherein the first reactive diluent and the second reactive diluent are n-butyl glycidyl ether reactive diluents.

10. A solvent-free coating as claimed in claim 1 wherein the defoamer comprises a mixture of a foam breaking polysiloxane and hydrophobic particles.

11. A solvent-free coating according to claim 1 wherein the levelling aid comprises a polyacrylate surface aid and/or a silicone surface aid.

12. A solventless coating according to claim 1 wherein the filler comprises quartz sand and/or ground calcium carbonate.

13. The solvent-free coating of claim 1, wherein the filler has a mesh size of 325 mesh or more.

14. The solvent-free coating of claim 1 wherein the a component further comprises 0.1 to 10 weight percent mill base.

15. A solvent free coating as in claim 14 wherein the a component further comprises 4 to 10 weight percent of a mill base.

16. The solvent-free paint according to claim 1, wherein the curing agent comprises any one or at least two of modified amine epoxy curing agent, polyamide epoxy curing agent and aliphatic polyamine curing agent.

17. The solventless coating according to claim 1, wherein the mass ratio of the A component to the B component is (3.5-4.5): 1.

18. A solvent-free coating according to claim 17, wherein the mass ratio of the a component to the B component is 4: 1.

19. A method of preparing a solventless coating according to any one of claims 1-18 comprising the steps of:

mixing a first resin and a first reactive diluent, performing third dispersion stirring, adding a defoaming agent and a leveling assistant in the third dispersion stirring process, performing fourth dispersion stirring, adding modified bentonite pre-gel in the fourth dispersion stirring process, performing fifth dispersion stirring, adding a filler in the fifth dispersion stirring process, performing sixth dispersion stirring, and cooling to obtain a component A in the solvent-free coating; mixing the component A and the component B.

20. The method of claim 19, further comprising adding color paste after the cooling and manually tinting with a paint spatula.

21. The method as claimed in claim 19, wherein the third dispersion stirring is performed at a rotation speed of 1000-1400 r/min.

22. The method according to claim 21, wherein the third dispersion stirring is performed at a rotation speed of 1200 r/min.

23. The method of claim 19, wherein the time of the third dispersion stirring is 8-12 min.

24. The method of claim 23, wherein the time of the third dispersion stirring is 10 min.

25. The method as claimed in claim 19, wherein the rotation speed of the fourth time of the dispersion stirring is 1000-.

26. The method as claimed in claim 25, wherein the fourth dispersion stirring is performed at a rotation speed of 1200 r/min.

27. The method of claim 19, wherein the fourth time of dispersive stirring is 8-12 min.

28. The method of claim 27, wherein the fourth time of dispersive stirring is 10 min.

29. The preparation method as claimed in claim 19, wherein the rotation speed of the fifth dispersion stirring is 1600-2000 r/min.

30. The method as claimed in claim 29, wherein the rotation speed of the fifth dispersion stirring is 1800 r/min.

31. The method of claim 19, wherein the time of the fifth dispersion stirring is 8-12 min.

32. The method of claim 31, wherein the time of the fifth dispersion stirring is 10 min.

33. The method as claimed in claim 19, wherein the rotation speed of the sixth dispersion stirring is 1600-2000 r/min.

34. The method of claim 33, wherein the sixth dispersion stirring is performed at 1800 rpm.

35. The method of claim 19, wherein the sixth dispersion stirring is carried out for 20-30 min.

36. The method of claim 35, wherein the sixth dispersion stirring time is 25 min.

37. The method according to claim 19, wherein the method comprises the steps of:

(2) mixing a first resin and a first reactive diluent, performing third dispersion stirring for 8-12min at the rotating speed of 1000-.

38. Use of the solvent-free coating of any one of claims 1-18 or prepared by the method of any one of claims 19-37 in the preparation of flooring.